Depends on what you are after..
Units like the one you posted work, some better than others, the better ones you a line out instead of a head set jack..
Bluetooth compresses the music if you are ok with the sound you will get from that, DAC'S(digital /analog converters) are not cheap for good ones so things like you posted, cheap ones will have a cheap converter.
Not knowing what or how old of a unit you are hooking to, but if it has a audio coax digital out or fiber op tos link out, I'd use that , and a Bluetooth adapter that will connect to that.. as you won't be relying on the dac in the Bluetooth unit to convert the analog head set info to a digital stream.. before compressing it to the bluwtooth format..
Even a Bluetooth unit that uses analog outputs from your stereo (rca jacks) will sound better than the cheaply amp signal from a headphone jack

FYI most older stereo's will have a tape loop (cassette) input and output, the output used to go to a deck to record, but can be used as a line level output for a Bluetooth unit.. if a digital out isn't offered on your stereo..

Depends on what you are after..
Units like the one you posted work, some better than others, the better ones you a line out instead of a head set jack..
...
FYI most older stereo's will have a tape loop (cassette) input and output, the output used to go to a deck to record, but can be used as a line level output for a Bluetooth unit.. if a digital out isn't offered on your stereo..

You wont get volume control from your old reciever if you use line out, you'll have to control it at the remote speaker

Before you worry about sound compression or other audiophile type concerns, think about how often your windows are open when driving your Chevelle or what have you. It's the overwhelming majority of the time. That alone "kills" the acoustics, so to speak......so I don't think it's really worth losing any sleep over.

It's very hard to get an old car to mirror the cabin sound of even something like my 2008 Trailblazer. Almost nothing we can do to our old A Bodies will make them sound like a newer car acoustically.

I'd just try to get good, clean sound at a sufficient enough level to your taste.

Before you worry about sound compression or other audiophile type concerns, think about how often your windows are open when driving your Chevelle or what have you. It's the overwhelming majority of the time. That alone "kills" the acoustics, so to speak......so I don't think it's really worth losing any sleep over.

It's very hard to get an old car to mirror the cabin sound of even something like my 2008 Trailblazer. Almost nothing we can do to our old A Bodies will make them sound like a newer car acoustically.

I'd just try to get good, clean sound at a sufficient enough level to your taste.

It probably goes without saying, but know that the "power" and "fidelity" of your system will be dictated by the amps in the bluetooth speakers, not your Pioneer's amp. You're basically using your receiver as an input source selector for the bluetooth speakers, and adding volume and tone control.

FYI-this is a Pioneer am/fm home stereo receiver from probably 1985 vintage

try to get a Bluetooth adapter that uses the line out.. instead of the headphone jack..
your mid 80's unit will have a line out,, either for an amp, a cassette deck or a reel to reel.. or an eq.. or all of them

I agree with Eric on range. My wireless headphones go about that range from my laptop.

You might have better luck getting external wireless speakers that will play off of your smart phone if you have one. Phone connected to your house wifi can stream whatever songs you have on the net or on the phone itself.

just get a boom box.. and some rechargeable batteries..
If I was to use Bluetooth like you want,, it be like said above, using your cell phone as the music source and stream whatever..
but a boom box.. is simple and many today have an input to connect your cellphone/ipod/etc..

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